Well put, Turnoi. I suspect that the fan of EF was likely employed in the service industry in a minor position before ending up at EF Changchun. Non-managerial jobs in the service sector usually entail long working hours and low pay. That's because, unlike professional posts, almost anybody can do them. If I had been previously employed as a hotel flunkie, for example, working a 60-hour week for a rubbishy salary, I'd have thought that 40 hours a week was heaven on earth.
I've taught in Changchun fairly recently, but at a real school, not at one of those rubbishy training centres there. I can tell you that there would be no need for EF or any other such employer to waste 4500 US $/month on a foreign teacher. The Chinese are not out of their minds when it comes to renumeration of foreign teachers. An average salary in Changchun for an FT is around 5000 RMB a month. To earn 8000 RMB a month there, one would be working all hours. 4500 US $ a month there as an FT's pay is fiction, just a pipedream. No way, Hose!